File "electrum/gui/qt/transaction_dialog.py", line 246, in do_broadcast
  File "electrum/gui/qt/main_window.py", line 1622, in save_pending_invoice
  File "electrum/wallet.py", line 790, in save_invoice
  File "electrum/wallet.py", line 315, in save_db
  File "electrum/wallet_db.py", line 1344, in write
  File "electrum/util.py", line 412, in <lambda>
  File "electrum/util.py", line 408, in do_profile
  File "electrum/wallet_db.py", line 1354, in _write
  File "electrum/storage.py", line 85, in write